Research Article

Experiments in Fluids

, Volume 50, Issue 6, pp 1625-1632

First online:

Scalar interactions between parallel jets measured using a two-channel PLIF technique

  • M. A. SoltysAffiliated withDepartment of Civil and Environmental Engineering, University of Colorado
  • , J. P. CrimaldiAffiliated withDepartment of Civil and Environmental Engineering, University of Colorado Email author 

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Abstract

A two-channel PLIF technique that simultaneously quantifies two scalar fields is presented. The technique consists of two independently operated single-color PLIF systems that synchronously image a common region. Two dyes (fluorescein sodium salt and oxazine 725) are excited by two lasers (argon-ion and krypton-ion), and the resulting fluorescence is imaged by a pair of cameras. The two-channel system is used to study mixing between two parallel jets, each transporting a different scalar species. Time-averaged and instantaneous mixing statistics are calculated and used to show the effects of turbulent structure on scalar mixing. In particular, the existence of positive spatial correlations between the two scalar fields is demonstrated in off-axis mixing regions.